Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5400039 | Journal of Luminescence | 2014 | 4 Pages |
Abstract
Acridine orange was first encapsulated into silica shell via a facile reverse microemusion method to built core-shell fluorescent nanoparticles. The nanoparticles are all in spherical shape and have a narrow size distribution, and its application as a optical pH sensor has been demonstrated. This novel sensor is based on the pH-dependent fluorescence intensities of acridine orange in different pH value. The fluorescence intensity of acridine orange-doped silica nanoparticles was decreased by increasing pH value. Under optimum conditions, the changes of fluorescence intensity were proportional to the pH value in the range of 8.00-10.90. In addition, the sensor can be easily separated by centrifugation and adds no pollution to the environment compared to the free dyes. Furthermore, the effects of ionic strength and co-existing substances were proved to have little influence on the determination of pH. The sensor has been successfully applied to determine the pH of two artificial samples. Hence, the core-shell fluorescent nanoparticles show potential for practical application.
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Authors
Jinshui Liu, Lingjie Zang, Yiru Wang, Guoning Liu,